http://svs.gsfc.nasa.gov
The Scientific Visualization Studio works closely with scientists to create data visualization products that promote a greater understanding of NASA Earth and Space Science research activities. Visualizations are searchable by keyword, mission, instrument, scientist, etc. They can be downloaded as movies of various file types and resolutions or as stills.

NASA Earth Observations (NEO)

http://neo.sci.gsfc.nasa.gov
NASA Earth Observations was developed to help museums, science centers and other informal education institutions access imagery of NASA's global datasets. Images are available in several formats, including those supported by Science On a Sphere and other global kiosk displays. Includes access by Web Mapping Service so that kiosks and other applications can update automatically.

My NASA Data

http://mynasadata.larc.nasa.gov
Students of all ages can investigate microsets of NASA Earth science satellite data, including atmosphere, biosphere, cryosphere, ocean and land surface. Data are available along with lesson plans, computer tools and an Earth science glossary. Citizen science project ideas are also available.

Giovanni

http://daac.gsfc.nasa.gov/giovanni
Giovanni provides a simple and intuitive way to visualize, analyze and access vast amounts of Earth science remote-sensing data without having to download the data.

Earth Science Picture of the Day

http://epod.usra.edu
Earth Science Picture of the Day collects and archives photos, imagery, graphics and artwork with short explanatory captions and links exemplifying features within the Earth system.